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I see some of the 42-48 distributors have the 2 piece caps with a one wire snap and some have the one piece finger cap with the 2 snaps I know there are 21A's and there are 59A's. Figuring the 59A is 46-48. What years had the one piece finger cap? I am leaning toward looking for the style with the one piece cap but wondering which distributor has the best curve? I'm more use to the later 8BA flatheads.